-Built in power supply
-A/C-D/C power source
-USB connections

Good for:
ProMaster: PDB-L40, PNB-1L, PNB-1LH, PNB-3L, PNB-3LH
Canon: NB-1L, NB-1LH, NB-3L, 
Kyocera: BP-760S, BP-1100S
Samsung: SLB-1437
Sanyo: DB-L40